Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f779264b2b17f2…

MALICIOUS

PDF

77.9 KB Created: 2021-08-27 12:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: dcac951ee474092b2e34d43b1d397d8b SHA-1: 30b32a337174d4a04481d660ee093aa2435cbfb1 SHA-256: d0f779264b2b17f22ec29be1fdbef97037d56214f1fc18599959861642eedfb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this file as malicious. The primary function appears to be redirecting users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/jfb78e0gtodbm19gl2un1jpvlm/71891769337.pdf In PDF document text
    • http://tycoonmedical.com/userfiles/file/73192608429.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6ed65840d---xokidijononap.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6c685295a---2325465147.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a6ce519f2---kikalefofamip.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/fuwidofe.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210503101744749.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/aba7e5caf3824cb4c69c952863ffdb19/68870648945.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106121205.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/ratasevinizewi.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/68036916223.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/cdf49d4fb111c6857dcaff457d7454d2/78407980169.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/52108230326.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/1l8dmi00bcs4ao6c6v1fpun501/96153054804.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/ab3aa1ace7618d7bcab7917cd17d31f6/26668421450.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/kanikonubumo.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/68100128731.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/e80cd7b455cade5f0697c259e8324636/navikawuke.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/wabelowirumub.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/jepomo.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/69414452842.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cfa954de3---rosesofogipinex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+draw+a+simple+sailboatPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDA 16596 bytes
SHA-256: 00c2d23fcd01d194e98c8bf9ffeb56b4bf29a7d21d24270e869dcd48c0224b77
font_01_sfnt_off0000f912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11129 10668 bytes
SHA-256: f8903dc8ea3cd3f4d8ee39d45bcfe79c1c8b523a089b6022bb0a29a2f49d4b32

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